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Baker Hughes
© 2020 Baker Hughes Company. All rights reserved.
XVI. Replacement Parts Planning
A. Basic Guidelines
The basic objective in formulating a service parts
inventory philosophy is to provide prompt service
capability, thus preventing maintenance outage time
extensions. To accomplish this, it is necessary to
have immediate availability of the proper inventory of
service parts for optimum valve quantities. This can
be achieved at a minimum of cost by defining the
inventory on a frequency of need basis.
To assist towards this objective, the Field Service
and Repair Organization of Baker Hughes
recommends that the following guidelines be utilized
to establish meaningful inventory levels.
1. Identify the total number of safety valves in
service by size, type number, temperature class,
and serial number.
2. Identify the frequency of replacement tendency
of specific parts.
Class I Parts Most Frequently Replaced
Class II Parts Less Frequently Replaced, but
Critical in the Event of an emergency
Requirement
Class III Parts Seldom Replaced
Class IV Hardware (e.g., nuts, bolts, pins, cap
components etc.)
Class V - Parts Practically Never Requiring
Replacement.
3. “Need Probability Coverage” is defined as
the probable percent of total, uninterrupted
operational time which can be expected by
stocking predetermined valve component
classifications.
Determine “need probability coverage” which is
compatible with a specific company’s operational
objectives and service parts inventory investment
philosophy. Then relate “need probability coverage”
to parts classifications which will satisfy that need.
Guidelines are as follows:
Parts Classification
Need Probability
Coverage
Class I
70%
Class I & II
85%
Class I, II, & III
95%
Class I, II, III & IV
99%
4. Consult recommended spare parts list by valve
type to determine quantity of parts for valves to
be covered by the inventory plan.
5. Select parts and specify quantities.
